STOCKTON - When a car rammed into and killed 3-year-old Ruben Ramirez, the force was great enough to crush his chest and displace his organs.

Such was the testimony of county Chief Medical Examiner Bennet Omalu when testifying Thursday as the trial of Aushua McDuff-Brown, who is charged with premeditated murder.

Ruben had been pinned between a car and the Madison Market building last October. Prosecutor Mark Ott said McDuff-Brown's attempted to strike another woman but instead hit Ruben.

Overwhelmed by images of Ruben's purple body on a medical table and the graphic details of his injuries, family members trickled out of the courtroom in tears during Omalu's testimony.

"He suffered traumatic shock," Omalu testified.

The District Attorney's Office is prosecuting the case using the theory of transferred intent - meaning the intent to kill was transferred to Ruben, who was a bystander.

McDuff-Brown, 23, has told investigators she didn't intentionally try to run down anyone, and her defense attorney is asking jury members to consider lesser charges.

An employee from the Stockton Unified School District office across the street from the market testified this week about witnessing the incident from an office window and the altercation between McDuff-Brown and another woman that led to the fatal crash.

Defense attorney Edward Healey has suggested through his questioning that the employee's view was obstructed by trees and nearby parked cars.

According to multiple witness accounts, McDuff-Brown had given a ride to her friend, Timothy Fonville, on Oct. 3, 2011, to drop off his two children in a custody exchange with his ex-girlfriend.

A woman in McDuff-Brown's back seat became involved in a verbal dispute with Fonville's ex-girlfriend, Antoinette Brooks, and Brooks' aunt, Shakara Daan. McDuff-Brown's passenger and Daan then fought.

Brooks and Daan went inside the store after the fight. Then, Daan walked out of the store. Some witnesses say she grabbed a scooter, others say a metal bar. They said she waved the object, and the car accelerated toward her.

Daan was seen moving out of the way and then striking the car’s windshield with the object she held.

The collision was partially captured by an interior store surveillance camera that faced the front door.